1921967 has 2 divisors, whose sum is σ = 1921968. Its totient is φ = 1921966.

The previous prime is 1921937. The next prime is 1921981. The reversal of 1921967 is 7691291.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1921967 - 2¹² = 1917871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1921937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 960983 + 960984.

It is an arithmetic number, because the mean of its divisors is an integer number (960984).

2^1921967 is an apocalyptic number.

1921967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1921967 is an equidigital number, since it uses as much as digits as its factorization.

1921967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 35.

The square root of 1921967 is about 1386.3502443466. The cubic root of 1921967 is about 124.3317296850.

The spelling of 1921967 in words is "one million, nine hundred twenty-one thousand, nine hundred sixty-seven".